Mining-engine.



Patented Oct. 3, I899.

B. YOCH.

MINING ENGINE.

(Application filed July 5, 1898.:

(No Model.)

NITED STATES ATENT Enron.

BENI-IARD YOOH, OF BELLEVILLE, ILLINOIS; AGNES YOCH EXECUTRIX OF SAID BENHARD YOOI-I, DECEASED.

MINING-ENGINE.

SPECIFICATION forming part of Letters Patent No. 634,422, dated October 3, 1899.

Application filed July 5,1898. Serial No. 685,185. (No model.)

To ail whom it may concern.-

Be it known that I, BENHARD Yoorr. a citizen of the United States, and a residentof Belleville, in the county of St. Clair and State of Illinois, have invented certain new and useful Improvements in Mining Engines, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification.

I have shown my present invention applied to a mining-engine, and to the particular construction of mining-engine that is shown in my Patents No. 251,987, issued January 3, 1882, and No. 306,570, issued October 14, 1884. My present invention, however, is capable of being employed or used in other forms of engines.

Heretofore it has been the practice to admit the fluid into the upper part of the cylinder on top of the piston, so that the direction of gravity of the piston and the direction of the fluid-pressure have been the same, the piston thus being caused to bear with considerable friction against the lower wall of the cylinder. By the use of my improvement the fluid is admitted beneath the horizontal central line of the piston,- which tends to support the piston when in position for its return stroke, the result being that the piston will start more freely in the cylinderand with less wear than with the old form of construction.

My invention consists in features of novelty hereinafter fully described, and pointed out in the claims.

Figure I is a vertical section of a miningmachine engine substantially as is shown in my patents referred to, with the addition thereto of my present improvement. The section is taken on line I I, Fig. II. Fig. II

is a transverse section taken on the line II II, Fig. I.

Referring to the drawings, 1 represents the cylinder of the engine, 2 the piston, and 3 the piston-rod.

4 represents the steam-chest and slide-valve mechanism, such as is shown in my Patents Nos. 306,570 and 251,987. As these parts form no part of my present invention and are fully described in their respective patents, further reference to them here will not be made.

Instead of admitting the fluid to the cylinder on top of the piston, as in the patents re= ferred to, I under my present invention provide the cylinder with segmental ports 5, that conduct the fluid to points beneath the horizontal central line of the piston, where it en ters the cylinder through openings 6 and tends to lift the piston against the action of gravity while the piston is passing the ports instead of acting with gravity to force the piston downward against the lower wall of the cylinder, the result being that the piston moves freely past the ports, and the wear between the piston and cylinder is much reduced. I have shown two of the ports 5 with openings 6, so that the fluid-pressure is equali-zedon. opposite sides of the piston; but my invention may in a measure be effected by a single port or passage from the chest to the cylinder at a point beneath the horizontal central line of the piston.

I claim as my invention 1. In an engine, the combination of a cylinder, a piston located within the cylinder, and a segmental fluid port or passage communicating with the cylinder beneath the horizontal central line of the piston, substantially as set forth.

2. In an engine, the combination of a cylinder, a piston, and segmental fluid ports or passages communicating with the cylinder on opposite sides at points beneath the horizon+ tal central line of the piston, substantially as set forth.

BENHARD YOOII.

In presence of E. S. KNIGHT, A. V. ALEXANDER. 

